Table 4.

An example for calculating the Cochran’s test statistic.

Test A	Test B	D = A–B	D2
4.91	4.97	− 0.06	0.0036
4.87	4.95	− 0.08	0.0064
4.87	4.96	− 0.09	0.0081
4.88	4.93	− 0.05	0.0025
4.89	4.94	− 0.05	0.0025
4.88	4.95	− 0.07	0.0049
4.89	4.94	− 0.05	0.0025
4.89	4.94	− 0.05	0.0025
4.91	4.96	− 0.05	0.0025
4.91	4.94	− 0.03	0.0009
Summation of squared difference		∑D2	0.036
Maximum squared difference		D2max	0.0081
Cochran’s test statistic		CCochran	0.225